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    <title>clGetEventInfo</title>
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    <div class="refentry">
      <a id="idm1"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="clGetEventInfo"></a>
        <h1>clGetEventInfo</h1>
        <p>
            Returns information about the event object.
        </p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
					<a class="link" href="scalarDataTypes.html" target="_top">cl_int</a>
                    <strong class="fsfunc">                   
                        clGetEventInfo
                    </strong>
                (</code>
                <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="_top">cl_event</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event</var>, </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_event_info" target="_top">cl_event_info</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_name</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">param_value_size</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">void</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value</var>, </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="_top">size_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*param_value_size_ret</var><code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="parameters"></a>
        <h2>Parameters</h2>
        <div class="variablelist">
          <dl class="variablelist">
            <dt>
              <span class="term">
                    <code class="varname"> 
                        event
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        Specifies the event object being queried.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        param_value
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                         A pointer to memory where the appropriate result being queried is returned. If <code class="varname">param_value</code> is NULL, it is ignored.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        param_value_size
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                         Specifies the size in bytes of memory pointed to by <code class="varname">param_value</code>. This size must be greater than or equal to the size of the return type as described in the table below.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        param_value_size_ret
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        Returns the actual size in bytes of data copied to <code class="varname">param_value</code>. If
<code class="varname">param_value_size_ret</code> is NULL, it is ignored.
                    </p>
            </dd>
            <dt>
              <span class="term">
                    <code class="varname"> 
                        param_name
                    </code>
                </span>
            </dt>
            <dd>
              <p> 
                        Specifies the information to query. The list of supported <code class="varname">param_name</code> types and the information returned in <code class="varname">param_value</code> by <code class="function">clGetEventInfo</code> is described in the table below:

                    </p>
              <div class="informaltable">
                <table class="informaltable" border="1">
                  <colgroup>
                    <col align="left" class="col1" />
                    <col align="left" class="col2" />
                    <col align="left" class="col3" />
                  </colgroup>
                  <thead>
                    <tr>
                      <th align="left">cl_event_info</th>
                      <th align="left">Return Type</th>
                      <th align="left">Information returned in <code class="varname">param_value</code></th>
                    </tr>
                  </thead>
                  <tbody>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_EVENT_COMMAND_QUEUE</code>
                      </td>
                      <td align="left">cl_command_queue</td>
                      <td align="left">
                                        Return the command-queue associated with <code class="varname">event</code>.
                                    </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_EVENT_COMMAND_TYPE</code>
                      </td>
                      <td align="left">cl_command_type</td>
                      <td align="left"><div class="literallayout"><p>Return the command associated with event. Can be one of the following values:<br />
CL_COMMAND_NDRANGE_KERNEL<br />
CL_COMMAND_TASK<br />
CL_COMMAND_NATIVE_KERNEL<br />
CL_COMMAND_READ_BUFFER<br />
CL_COMMAND_WRITE_BUFFER<br />
CL_COMMAND_COPY_BUFFER<br />
CL_COMMAND_READ_IMAGE<br />
CL_COMMAND_WRITE_IMAGE<br />
CL_COMMAND_COPY_IMAGE<br />
CL_COMMAND_COPY_BUFFER_TO_IMAGE<br />
CL_COMMAND_COPY_IMAGE_TO_BUFFER<br />
CL_COMMAND_MAP_BUFFER<br />
CL_COMMAND_MAP_IMAGE<br />
CL_COMMAND_UNMAP_MEM_OBJECT<br />
CL_COMMAND_MARKER<br />
CL_COMMAND_ACQUIRE_GL_OBJECTS<br />
CL_COMMAND_RELEASE_GL_OBJECTS</p></div>
                                    </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_EVENT_COMMAND_ EXECUTION_STATUS</code>
                      </td>
                      <td align="left">cl_int</td>
                      <td align="left">
                                        Return the execution status of the command identified by <code class="varname">event</code>. The valid values are:
<p>CL_QUEUED (command has been enqueued in the command-queue),</p>
<p>CL_SUBMITTED (enqueued command has been submitted by the host to the device associated with the command-queue),</p>
<p>CL_RUNNING (device is currently executing this command),</p>
<p>CL_COMPLETE (the command has completed), or</p>
<p>Error code given by a negative integer value. (command was abnormally terminated – this
may be caused by a bad memory access etc.)</p>

                                    </td>
                    </tr>
                    <tr>
                      <td align="left">
                        <code class="constant">CL_EVENT_REFERENCE_COUNT</code>
                      </td>
                      <td align="left">cl_uint</td>
                      <td align="left">
                                        Return the <code class="varname">event</code> reference count. The reference count returned should be considered immediately stale. It is unsuitable for general use in applications. This feature is provided for identifying memory leaks.
                                    </td>
                    </tr>
                  </tbody>
                </table>
              </div>
            </dd>
          </dl>
        </div>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
            Using <code class="function">clGetEventInfo</code> to determine if a command identified by event has finished execution (i.e. <code class="constant">CL_EVENT_COMMAND_EXECUTION_STATUS</code> returns <code class="constant">CL_COMPLETE</code>) is not a synchronization point. There are no guarantees that the memory objects being modified by command associated with <code class="varname">event</code> will be visible to other enqueued commands.
        </p>
      </div>
      <div class="refsect1">
        <a id="errors"></a>
        <h2>Errors</h2>
        <p>
            Returns <span class="errorname">CL_SUCCESS</span> if the function executed successfully, or one of the errors below:
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">param_name</code> is not valid, or if size in bytes specified by <code class="varname">param_value_size</code> is less than size of return type as described in the table above and <code class="varname">param_value</code> is not NULL.
            </li>
            <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_EVENT</span> if <code class="varname">event</code> is not a valid event object.
            </li>
          </ul>
        </div>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />
                                                 
            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.0.pdf#page=117" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p> 
			<a class="citerefentry" href="clReleaseEvent.html"><span class="citerefentry"><span class="refentrytitle">clReleaseEvent</span></span></a>, 
			<a class="citerefentry" href="clRetainEvent.html"><span class="citerefentry"><span class="refentrytitle">clRetainEvent</span></span></a>, 
			<a class="citerefentry" href="clWaitForEvents.html"><span class="citerefentry"><span class="refentrytitle">clWaitForEvents</span></span></a> 
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2009 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
permit persons to whom the Materials are furnished to do so, subject to
the condition that this copyright notice and permission notice shall be included
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